41results about How to "Reduce detection noise" patented technology

A nano-resonator device comprising at least one fixed element and at least one mobile element with respect to the fixed element, first electromagnetic means, integrated or fixed on the fixed element, and second electromagnetic means, integrated or fixed on the mobile element, to generate an oscillating movement of the mobile element.

Systems and methods for multiplexing two or more channels of a quantum key distribution (QKD) system are disclosed. A method includes putting the optical public channel signal (SP1) in return-to-zero (RZ) format in a transmitter (T) in one QKD station (Alice) and amplifying this signal (thereby forming SP1*) just prior to this signal being detected with a detector (30) in a receiver (R) at the other QKD station (Bob). The method further includes precisely gating the detector via a gating element (40) and a coincident signal (PN1′) with pulses that coincide with the expected arrival times of the pulses in the detected (electrical) public channel signal (SP2). This allows for the public channel signal to have much less power, making it more amenable for multiplexing with the other QKD signals.

The invention discloses a receiving end light power on-line detection device and an implementation method thereof. The receiving end light power on-line detection device comprises a universal ONU (Optical Network Unit) module and a data acquisition and processing module, wherein the universal ONU module comprises a photoelectric conversion circuit and an operational amplifying circuit; and the device is characterized in that: an external BNC (Bayonet Nut Connector) terminal is additionally arranged on the universal ONU module and is connected with an output end of the operational amplifying circuit. In the invention, real-time on-line monitoring of an optical fiber channel state can be realized under the condition of normal communication of an optical fiber communication system.

The invention discloses a portable microfluidic detection apparatus and method for organophosphorus pesticide. A microfluidic chip is fixed at the upper part in a shell of a detector; the microfluidic chip is provided with, from left to right, a sample pretreatment and introduction chamber, an impurity filtering assembly, a mixed driving assembly, a porous medium enzyme reaction assembly, a reaction chamber, a photoelectric detection chamber and a waste liquid discharge outlet which are successively connected and communicated; a permanent magnet fixedly connected with the upper surface of a waterproof rotary grinding plug is arranged under an electromagnet, and the waterproof rotary grinding plug is located over the sample pretreatment and introduction chamber and can move downwardly to match with the sample pretreatment and introduction chamber; a grinding motor is installed in the waterproof rotary grinding plug and is connected with a grinding rotary cake through a grinding motor shaft; and a 405-nm laser diode is fixedly arranged over a photoelectric detection chamber, and a photoelectric detector is fixedly arranged under the photoelectric detection chamber. The portable microfluidic detection apparatus and method provided by the invention have a sample pretreatment function and can improve sample purity, enhance a contact area between organophosphorus hydrolase and a detection fluid and effectively guarantee detection effects.